Add feature flags, seed data utilities, and Angular frontend scaffold

Major enhancements:
- Feature flag system for cloud vs air-gapped deployment modes
- Automatic storage backend selection based on deployment mode
- Comprehensive seed data generation utilities
- Support for generating CSV, JSON, binary, and PCAP test files
- Quick seed script for easy data generation
- Angular 19 frontend complete setup documentation
- Material Design UI component examples and configuration

Fixes:
- Resolve SQLAlchemy metadata column name conflict
- Rename metadata to custom_metadata throughout codebase
- Fix API health check issues

Documentation:
- FEATURES.md - Complete feature overview
- FRONTEND_SETUP.md - Angular 19 setup guide with examples
- SUMMARY.md - Implementation summary

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/schemas/artifact.py

@@ -8,7 +8,7 @@ class ArtifactCreate(BaseModel):
     test_suite: Optional[str] = None
     test_config: Optional[Dict[str, Any]] = None
     test_result: Optional[str] = None
-    metadata: Optional[Dict[str, Any]] = None
+    custom_metadata: Optional[Dict[str, Any]] = None
     description: Optional[str] = None
     tags: Optional[List[str]] = None
     version: Optional[str] = None
@@ -26,7 +26,7 @@ class ArtifactResponse(BaseModel):
     test_suite: Optional[str] = None
     test_config: Optional[Dict[str, Any]] = None
     test_result: Optional[str] = None
-    metadata: Optional[Dict[str, Any]] = None
+    custom_metadata: Optional[Dict[str, Any]] = None
     description: Optional[str] = None
     tags: Optional[List[str]] = None
     created_at: datetime